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This CL makes GMC notifications clickable. When clicked, the tab that
originated the media is focused.

Bug: 1011052
Change-Id: I4f14cf8f5d19e12afbb5eaf11c1b8e7ac1a042c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1862868
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Jazz Xu <jazzhsu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706728}